Consider a few things carefully.
PCI Express will appear towards the end of 2004, with new vid cards to go with it! PCI Express is supported by the new Athlon64 Chipsets, PCI Express and DDR2. The Athlon 64FX requires Registered Ram, not just plain DDR, so it is more expensive to build a FX.
Get a least a 500W PSU - they're not expensive these days - and many good cases come with 500W (mine did) - oh yes, and mines screwless, consider that also, it's much easier.
If you have any specific questions please go ahead and ask them, I will pop in regular like to respond.
:cya: :cya: :cya: